EDM Method and apparatus utilizing successive trains of elementa

Details EDM Method and apparatus utilizing successive trains of elementa EDM Method and apparatus utilizing successive trains of elementa

1980-06-27

1982-11-02

Shaw, C. C.

Electric heating

Metal heating

Cutting or disintegrating

219 69P, 219 69C, B23K 108

Patent

active

043575161

ABSTRACT:
EDM method and apparatus in which the electrical discharge machining pulses are produced by the application across the machining gap of a succession of time-spaced trains A of discrete elementary pulses a having an on-time .tau.on and off-time .tau.off, the trains having a duration Ton and an interval Toff. In a machining process, upon occurrence of an arcing, short-circuiting or excessive gap contamination condition, either of the off-time .tau.off or the cut-off interval Toff is increased. When the one controlled time .tau.off or Toff is increased to be greater than a predetermined value, the other, Toff or .tau.off, is decreased generally inversely proportionally to the increased .tau.off or Toff. When .tau.off or Toff is decreased to be smaller than a predetermined level, Toff or .tau.off are increased. Preferably, the sum of total off-times .tau.off plus the cut-off interval Toff in a single cycle or period of successive trains A is maintained at a present value so that the mean machining current is maintained constant as desired.

REFERENCES:
patent: Re29589 (1978-03-01), Inoue
patent: 3558842 (1971-01-01), Livshits et al.
patent: 3943321 (1976-03-01), Pfau et al.
patent: 4071729 (1978-01-01), Bell, Jr.
patent: 4236057 (1980-11-01), Inoue

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